class_docstr: Black amplitude contour waveform.
      
class_docstr_tok: ["Black","amplitude","contour","waveform","."]
code: def __init__(
      self,
      width=1024,
      height=256,
      bg_color=(0, 0, 0),
      color_scheme="default",
  ):
      super(WaveformContourBlack, self).__init__(
          width, height, bg_color, color_scheme
      )
      self.contour = numpy.zeros(self.image_width)
      self.ndiv = 4
      self.x = numpy.r_[0 : self.image_width - 1 : 1]
      self.symetry = True
      self.color_offset = 160
  
file_path: TimeSide/timeside/plugins/grapher/waveform_contour.py
imports: from timeside.core import implements, interfacedoc
  from timeside.core.api import IGrapher
  from .waveform_simple import Waveform
  from .utils import peaks
  import numpy
label_desc: Use image node_id 1 to create a new WaveformContourBlack object from inherited base classes: Waveform with example: obj = WaveformContourBlack(width, height, bg_color, color_scheme)